]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Postprocess module symbol versions |
2 | * | |
3 | * Copyright 2003 Kai Germaschewski | |
4 | * Copyright 2002-2004 Rusty Russell, IBM Corporation | |
df578e7d | 5 | * Copyright 2006-2008 Sam Ravnborg |
1da177e4 LT |
6 | * Based in part on module-init-tools/depmod.c,file2alias |
7 | * | |
8 | * This software may be used and distributed according to the terms | |
9 | * of the GNU General Public License, incorporated herein by reference. | |
10 | * | |
11 | * Usage: modpost vmlinux module1.o module2.o ... | |
12 | */ | |
13 | ||
b2e3e658 MD |
14 | #define _GNU_SOURCE |
15 | #include <stdio.h> | |
1da177e4 | 16 | #include <ctype.h> |
5003bab8 | 17 | #include <string.h> |
712f9b46 | 18 | #include <limits.h> |
d4ef1c30 | 19 | #include <stdbool.h> |
1da177e4 | 20 | #include "modpost.h" |
5a865c06 | 21 | #include "../../include/generated/autoconf.h" |
b817f6fe | 22 | #include "../../include/linux/license.h" |
b92021b0 | 23 | #include "../../include/linux/export.h" |
9e1b9b80 | 24 | |
1da177e4 LT |
25 | /* Are we using CONFIG_MODVERSIONS? */ |
26 | int modversions = 0; | |
27 | /* Warn about undefined symbols? (do so if we have vmlinux) */ | |
28 | int have_vmlinux = 0; | |
29 | /* Is CONFIG_MODULE_SRCVERSION_ALL set? */ | |
30 | static int all_versions = 0; | |
040fcc81 SR |
31 | /* If we are modposting external module set to 1 */ |
32 | static int external_module = 0; | |
8d8d8289 SR |
33 | /* Warn about section mismatch in vmlinux if set to 1 */ |
34 | static int vmlinux_section_warnings = 1; | |
c53ddacd KK |
35 | /* Only warn about unresolved symbols */ |
36 | static int warn_unresolved = 0; | |
bd5cbced | 37 | /* How a symbol is exported */ |
588ccd73 SR |
38 | static int sec_mismatch_count = 0; |
39 | static int sec_mismatch_verbose = 1; | |
40 | ||
c96fca21 SR |
41 | enum export { |
42 | export_plain, export_unused, export_gpl, | |
43 | export_unused_gpl, export_gpl_future, export_unknown | |
44 | }; | |
1da177e4 | 45 | |
6d9a89ea AK |
46 | #define PRINTF __attribute__ ((format (printf, 1, 2))) |
47 | ||
48 | PRINTF void fatal(const char *fmt, ...) | |
1da177e4 LT |
49 | { |
50 | va_list arglist; | |
51 | ||
52 | fprintf(stderr, "FATAL: "); | |
53 | ||
54 | va_start(arglist, fmt); | |
55 | vfprintf(stderr, fmt, arglist); | |
56 | va_end(arglist); | |
57 | ||
58 | exit(1); | |
59 | } | |
60 | ||
6d9a89ea | 61 | PRINTF void warn(const char *fmt, ...) |
1da177e4 LT |
62 | { |
63 | va_list arglist; | |
64 | ||
65 | fprintf(stderr, "WARNING: "); | |
66 | ||
67 | va_start(arglist, fmt); | |
68 | vfprintf(stderr, fmt, arglist); | |
69 | va_end(arglist); | |
70 | } | |
71 | ||
6d9a89ea | 72 | PRINTF void merror(const char *fmt, ...) |
2a116659 MW |
73 | { |
74 | va_list arglist; | |
75 | ||
76 | fprintf(stderr, "ERROR: "); | |
77 | ||
78 | va_start(arglist, fmt); | |
79 | vfprintf(stderr, fmt, arglist); | |
80 | va_end(arglist); | |
81 | } | |
82 | ||
d4ef1c30 RR |
83 | static inline bool strends(const char *str, const char *postfix) |
84 | { | |
85 | if (strlen(str) < strlen(postfix)) | |
86 | return false; | |
87 | ||
88 | return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; | |
89 | } | |
90 | ||
040fcc81 SR |
91 | static int is_vmlinux(const char *modname) |
92 | { | |
93 | const char *myname; | |
94 | ||
df578e7d SR |
95 | myname = strrchr(modname, '/'); |
96 | if (myname) | |
040fcc81 SR |
97 | myname++; |
98 | else | |
99 | myname = modname; | |
100 | ||
741f98fe SR |
101 | return (strcmp(myname, "vmlinux") == 0) || |
102 | (strcmp(myname, "vmlinux.o") == 0); | |
040fcc81 SR |
103 | } |
104 | ||
1da177e4 LT |
105 | void *do_nofail(void *ptr, const char *expr) |
106 | { | |
df578e7d | 107 | if (!ptr) |
1da177e4 | 108 | fatal("modpost: Memory allocation failure: %s.\n", expr); |
df578e7d | 109 | |
1da177e4 LT |
110 | return ptr; |
111 | } | |
112 | ||
113 | /* A list of all modules we processed */ | |
1da177e4 LT |
114 | static struct module *modules; |
115 | ||
5c3ead8c | 116 | static struct module *find_module(char *modname) |
1da177e4 LT |
117 | { |
118 | struct module *mod; | |
119 | ||
120 | for (mod = modules; mod; mod = mod->next) | |
121 | if (strcmp(mod->name, modname) == 0) | |
122 | break; | |
123 | return mod; | |
124 | } | |
125 | ||
d4ef1c30 | 126 | static struct module *new_module(const char *modname) |
1da177e4 LT |
127 | { |
128 | struct module *mod; | |
d4ef1c30 | 129 | char *p; |
62070fa4 | 130 | |
1da177e4 LT |
131 | mod = NOFAIL(malloc(sizeof(*mod))); |
132 | memset(mod, 0, sizeof(*mod)); | |
133 | p = NOFAIL(strdup(modname)); | |
134 | ||
135 | /* strip trailing .o */ | |
d4ef1c30 RR |
136 | if (strends(p, ".o")) { |
137 | p[strlen(p) - 2] = '\0'; | |
138 | mod->is_dot_o = 1; | |
139 | } | |
1da177e4 LT |
140 | |
141 | /* add to list */ | |
142 | mod->name = p; | |
b817f6fe | 143 | mod->gpl_compatible = -1; |
1da177e4 LT |
144 | mod->next = modules; |
145 | modules = mod; | |
146 | ||
147 | return mod; | |
148 | } | |
149 | ||
150 | /* A hash of all exported symbols, | |
151 | * struct symbol is also used for lists of unresolved symbols */ | |
152 | ||
153 | #define SYMBOL_HASH_SIZE 1024 | |
154 | ||
155 | struct symbol { | |
156 | struct symbol *next; | |
157 | struct module *module; | |
158 | unsigned int crc; | |
159 | int crc_valid; | |
160 | unsigned int weak:1; | |
040fcc81 SR |
161 | unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ |
162 | unsigned int kernel:1; /* 1 if symbol is from kernel | |
163 | * (only for external modules) **/ | |
8e70c458 | 164 | unsigned int preloaded:1; /* 1 if symbol from Module.symvers */ |
bd5cbced | 165 | enum export export; /* Type of export */ |
1da177e4 LT |
166 | char name[0]; |
167 | }; | |
168 | ||
169 | static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; | |
170 | ||
171 | /* This is based on the hash agorithm from gdbm, via tdb */ | |
172 | static inline unsigned int tdb_hash(const char *name) | |
173 | { | |
174 | unsigned value; /* Used to compute the hash value. */ | |
175 | unsigned i; /* Used to cycle through random values. */ | |
176 | ||
177 | /* Set the initial value from the key size. */ | |
df578e7d | 178 | for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
1da177e4 LT |
179 | value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); |
180 | ||
181 | return (1103515243 * value + 12345); | |
182 | } | |
183 | ||
5c3ead8c SR |
184 | /** |
185 | * Allocate a new symbols for use in the hash of exported symbols or | |
186 | * the list of unresolved symbols per module | |
187 | **/ | |
188 | static struct symbol *alloc_symbol(const char *name, unsigned int weak, | |
189 | struct symbol *next) | |
1da177e4 LT |
190 | { |
191 | struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); | |
192 | ||
193 | memset(s, 0, sizeof(*s)); | |
194 | strcpy(s->name, name); | |
195 | s->weak = weak; | |
196 | s->next = next; | |
197 | return s; | |
198 | } | |
199 | ||
200 | /* For the hash of exported symbols */ | |
bd5cbced RP |
201 | static struct symbol *new_symbol(const char *name, struct module *module, |
202 | enum export export) | |
1da177e4 LT |
203 | { |
204 | unsigned int hash; | |
205 | struct symbol *new; | |
206 | ||
207 | hash = tdb_hash(name) % SYMBOL_HASH_SIZE; | |
208 | new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); | |
209 | new->module = module; | |
bd5cbced | 210 | new->export = export; |
040fcc81 | 211 | return new; |
1da177e4 LT |
212 | } |
213 | ||
5c3ead8c | 214 | static struct symbol *find_symbol(const char *name) |
1da177e4 LT |
215 | { |
216 | struct symbol *s; | |
217 | ||
218 | /* For our purposes, .foo matches foo. PPC64 needs this. */ | |
219 | if (name[0] == '.') | |
220 | name++; | |
221 | ||
df578e7d | 222 | for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
1da177e4 LT |
223 | if (strcmp(s->name, name) == 0) |
224 | return s; | |
225 | } | |
226 | return NULL; | |
227 | } | |
228 | ||
bd5cbced RP |
229 | static struct { |
230 | const char *str; | |
231 | enum export export; | |
232 | } export_list[] = { | |
233 | { .str = "EXPORT_SYMBOL", .export = export_plain }, | |
c96fca21 | 234 | { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
bd5cbced | 235 | { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
c96fca21 | 236 | { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
bd5cbced RP |
237 | { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, |
238 | { .str = "(unknown)", .export = export_unknown }, | |
239 | }; | |
240 | ||
241 | ||
242 | static const char *export_str(enum export ex) | |
243 | { | |
244 | return export_list[ex].str; | |
245 | } | |
246 | ||
df578e7d | 247 | static enum export export_no(const char *s) |
bd5cbced RP |
248 | { |
249 | int i; | |
df578e7d | 250 | |
534b89a9 SR |
251 | if (!s) |
252 | return export_unknown; | |
bd5cbced RP |
253 | for (i = 0; export_list[i].export != export_unknown; i++) { |
254 | if (strcmp(export_list[i].str, s) == 0) | |
255 | return export_list[i].export; | |
256 | } | |
257 | return export_unknown; | |
258 | } | |
259 | ||
62a26356 AIB |
260 | static const char *sec_name(struct elf_info *elf, int secindex); |
261 | ||
262 | #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0) | |
263 | ||
264 | static enum export export_from_secname(struct elf_info *elf, unsigned int sec) | |
265 | { | |
266 | const char *secname = sec_name(elf, sec); | |
267 | ||
268 | if (strstarts(secname, "___ksymtab+")) | |
269 | return export_plain; | |
270 | else if (strstarts(secname, "___ksymtab_unused+")) | |
271 | return export_unused; | |
272 | else if (strstarts(secname, "___ksymtab_gpl+")) | |
273 | return export_gpl; | |
274 | else if (strstarts(secname, "___ksymtab_unused_gpl+")) | |
275 | return export_unused_gpl; | |
276 | else if (strstarts(secname, "___ksymtab_gpl_future+")) | |
277 | return export_gpl_future; | |
278 | else | |
279 | return export_unknown; | |
280 | } | |
281 | ||
1ce53adf | 282 | static enum export export_from_sec(struct elf_info *elf, unsigned int sec) |
bd5cbced RP |
283 | { |
284 | if (sec == elf->export_sec) | |
285 | return export_plain; | |
c96fca21 SR |
286 | else if (sec == elf->export_unused_sec) |
287 | return export_unused; | |
bd5cbced RP |
288 | else if (sec == elf->export_gpl_sec) |
289 | return export_gpl; | |
c96fca21 SR |
290 | else if (sec == elf->export_unused_gpl_sec) |
291 | return export_unused_gpl; | |
bd5cbced RP |
292 | else if (sec == elf->export_gpl_future_sec) |
293 | return export_gpl_future; | |
294 | else | |
295 | return export_unknown; | |
296 | } | |
297 | ||
5c3ead8c SR |
298 | /** |
299 | * Add an exported symbol - it may have already been added without a | |
300 | * CRC, in this case just update the CRC | |
301 | **/ | |
bd5cbced RP |
302 | static struct symbol *sym_add_exported(const char *name, struct module *mod, |
303 | enum export export) | |
1da177e4 LT |
304 | { |
305 | struct symbol *s = find_symbol(name); | |
306 | ||
307 | if (!s) { | |
bd5cbced | 308 | s = new_symbol(name, mod, export); |
8e70c458 SR |
309 | } else { |
310 | if (!s->preloaded) { | |
7b75b13c | 311 | warn("%s: '%s' exported twice. Previous export " |
8e70c458 SR |
312 | "was in %s%s\n", mod->name, name, |
313 | s->module->name, | |
314 | is_vmlinux(s->module->name) ?"":".ko"); | |
4b21960f TP |
315 | } else { |
316 | /* In case Modules.symvers was out of date */ | |
317 | s->module = mod; | |
8e70c458 | 318 | } |
1da177e4 | 319 | } |
8e70c458 | 320 | s->preloaded = 0; |
040fcc81 SR |
321 | s->vmlinux = is_vmlinux(mod->name); |
322 | s->kernel = 0; | |
bd5cbced | 323 | s->export = export; |
040fcc81 SR |
324 | return s; |
325 | } | |
326 | ||
327 | static void sym_update_crc(const char *name, struct module *mod, | |
bd5cbced | 328 | unsigned int crc, enum export export) |
040fcc81 SR |
329 | { |
330 | struct symbol *s = find_symbol(name); | |
331 | ||
332 | if (!s) | |
bd5cbced | 333 | s = new_symbol(name, mod, export); |
040fcc81 SR |
334 | s->crc = crc; |
335 | s->crc_valid = 1; | |
1da177e4 LT |
336 | } |
337 | ||
5c3ead8c | 338 | void *grab_file(const char *filename, unsigned long *size) |
1da177e4 LT |
339 | { |
340 | struct stat st; | |
eb3d5cc6 | 341 | void *map = MAP_FAILED; |
1da177e4 LT |
342 | int fd; |
343 | ||
344 | fd = open(filename, O_RDONLY); | |
eb3d5cc6 | 345 | if (fd < 0) |
1da177e4 | 346 | return NULL; |
eb3d5cc6 JJ |
347 | if (fstat(fd, &st)) |
348 | goto failed; | |
1da177e4 LT |
349 | |
350 | *size = st.st_size; | |
351 | map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); | |
1da177e4 | 352 | |
eb3d5cc6 JJ |
353 | failed: |
354 | close(fd); | |
1da177e4 LT |
355 | if (map == MAP_FAILED) |
356 | return NULL; | |
357 | return map; | |
358 | } | |
359 | ||
5c3ead8c SR |
360 | /** |
361 | * Return a copy of the next line in a mmap'ed file. | |
362 | * spaces in the beginning of the line is trimmed away. | |
363 | * Return a pointer to a static buffer. | |
364 | **/ | |
df578e7d | 365 | char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
1da177e4 LT |
366 | { |
367 | static char line[4096]; | |
368 | int skip = 1; | |
369 | size_t len = 0; | |
370 | signed char *p = (signed char *)file + *pos; | |
371 | char *s = line; | |
372 | ||
df578e7d | 373 | for (; *pos < size ; (*pos)++) { |
1da177e4 LT |
374 | if (skip && isspace(*p)) { |
375 | p++; | |
376 | continue; | |
377 | } | |
378 | skip = 0; | |
379 | if (*p != '\n' && (*pos < size)) { | |
380 | len++; | |
381 | *s++ = *p++; | |
382 | if (len > 4095) | |
383 | break; /* Too long, stop */ | |
384 | } else { | |
385 | /* End of string */ | |
386 | *s = '\0'; | |
387 | return line; | |
388 | } | |
389 | } | |
390 | /* End of buffer */ | |
391 | return NULL; | |
392 | } | |
393 | ||
5c3ead8c | 394 | void release_file(void *file, unsigned long size) |
1da177e4 LT |
395 | { |
396 | munmap(file, size); | |
397 | } | |
398 | ||
85bd2fdd | 399 | static int parse_elf(struct elf_info *info, const char *filename) |
1da177e4 LT |
400 | { |
401 | unsigned int i; | |
85bd2fdd | 402 | Elf_Ehdr *hdr; |
1da177e4 LT |
403 | Elf_Shdr *sechdrs; |
404 | Elf_Sym *sym; | |
1ce53adf DV |
405 | const char *secstrings; |
406 | unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; | |
1da177e4 LT |
407 | |
408 | hdr = grab_file(filename, &info->size); | |
409 | if (!hdr) { | |
410 | perror(filename); | |
6803dc0e | 411 | exit(1); |
1da177e4 LT |
412 | } |
413 | info->hdr = hdr; | |
85bd2fdd SR |
414 | if (info->size < sizeof(*hdr)) { |
415 | /* file too small, assume this is an empty .o file */ | |
416 | return 0; | |
417 | } | |
418 | /* Is this a valid ELF file? */ | |
419 | if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || | |
420 | (hdr->e_ident[EI_MAG1] != ELFMAG1) || | |
421 | (hdr->e_ident[EI_MAG2] != ELFMAG2) || | |
422 | (hdr->e_ident[EI_MAG3] != ELFMAG3)) { | |
423 | /* Not an ELF file - silently ignore it */ | |
424 | return 0; | |
425 | } | |
1da177e4 | 426 | /* Fix endianness in ELF header */ |
7d875a02 AK |
427 | hdr->e_type = TO_NATIVE(hdr->e_type); |
428 | hdr->e_machine = TO_NATIVE(hdr->e_machine); | |
429 | hdr->e_version = TO_NATIVE(hdr->e_version); | |
430 | hdr->e_entry = TO_NATIVE(hdr->e_entry); | |
431 | hdr->e_phoff = TO_NATIVE(hdr->e_phoff); | |
432 | hdr->e_shoff = TO_NATIVE(hdr->e_shoff); | |
433 | hdr->e_flags = TO_NATIVE(hdr->e_flags); | |
434 | hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); | |
435 | hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); | |
436 | hdr->e_phnum = TO_NATIVE(hdr->e_phnum); | |
437 | hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); | |
438 | hdr->e_shnum = TO_NATIVE(hdr->e_shnum); | |
439 | hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); | |
1da177e4 LT |
440 | sechdrs = (void *)hdr + hdr->e_shoff; |
441 | info->sechdrs = sechdrs; | |
442 | ||
a83710e5 PS |
443 | /* Check if file offset is correct */ |
444 | if (hdr->e_shoff > info->size) { | |
df578e7d SR |
445 | fatal("section header offset=%lu in file '%s' is bigger than " |
446 | "filesize=%lu\n", (unsigned long)hdr->e_shoff, | |
447 | filename, info->size); | |
a83710e5 PS |
448 | return 0; |
449 | } | |
450 | ||
6845756b | 451 | if (hdr->e_shnum == SHN_UNDEF) { |
1ce53adf DV |
452 | /* |
453 | * There are more than 64k sections, | |
454 | * read count from .sh_size. | |
1ce53adf DV |
455 | */ |
456 | info->num_sections = TO_NATIVE(sechdrs[0].sh_size); | |
457 | } | |
458 | else { | |
459 | info->num_sections = hdr->e_shnum; | |
460 | } | |
461 | if (hdr->e_shstrndx == SHN_XINDEX) { | |
6845756b | 462 | info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link); |
1ce53adf DV |
463 | } |
464 | else { | |
465 | info->secindex_strings = hdr->e_shstrndx; | |
466 | } | |
467 | ||
1da177e4 | 468 | /* Fix endianness in section headers */ |
1ce53adf | 469 | for (i = 0; i < info->num_sections; i++) { |
7d875a02 AK |
470 | sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); |
471 | sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); | |
472 | sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); | |
473 | sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); | |
474 | sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); | |
475 | sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); | |
476 | sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); | |
477 | sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); | |
478 | sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); | |
479 | sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); | |
1da177e4 LT |
480 | } |
481 | /* Find symbol table. */ | |
1ce53adf DV |
482 | secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; |
483 | for (i = 1; i < info->num_sections; i++) { | |
bd5cbced | 484 | const char *secname; |
56fc82c5 | 485 | int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
1da177e4 | 486 | |
56fc82c5 | 487 | if (!nobits && sechdrs[i].sh_offset > info->size) { |
df578e7d SR |
488 | fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " |
489 | "sizeof(*hrd)=%zu\n", filename, | |
490 | (unsigned long)sechdrs[i].sh_offset, | |
491 | sizeof(*hdr)); | |
85bd2fdd SR |
492 | return 0; |
493 | } | |
bd5cbced RP |
494 | secname = secstrings + sechdrs[i].sh_name; |
495 | if (strcmp(secname, ".modinfo") == 0) { | |
56fc82c5 TH |
496 | if (nobits) |
497 | fatal("%s has NOBITS .modinfo\n", filename); | |
1da177e4 LT |
498 | info->modinfo = (void *)hdr + sechdrs[i].sh_offset; |
499 | info->modinfo_len = sechdrs[i].sh_size; | |
bd5cbced RP |
500 | } else if (strcmp(secname, "__ksymtab") == 0) |
501 | info->export_sec = i; | |
c96fca21 SR |
502 | else if (strcmp(secname, "__ksymtab_unused") == 0) |
503 | info->export_unused_sec = i; | |
bd5cbced RP |
504 | else if (strcmp(secname, "__ksymtab_gpl") == 0) |
505 | info->export_gpl_sec = i; | |
c96fca21 SR |
506 | else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) |
507 | info->export_unused_gpl_sec = i; | |
bd5cbced RP |
508 | else if (strcmp(secname, "__ksymtab_gpl_future") == 0) |
509 | info->export_gpl_future_sec = i; | |
510 | ||
1ce53adf DV |
511 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
512 | unsigned int sh_link_idx; | |
513 | symtab_idx = i; | |
514 | info->symtab_start = (void *)hdr + | |
515 | sechdrs[i].sh_offset; | |
516 | info->symtab_stop = (void *)hdr + | |
517 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
6845756b | 518 | sh_link_idx = sechdrs[i].sh_link; |
1ce53adf DV |
519 | info->strtab = (void *)hdr + |
520 | sechdrs[sh_link_idx].sh_offset; | |
521 | } | |
1da177e4 | 522 | |
1ce53adf DV |
523 | /* 32bit section no. table? ("more than 64k sections") */ |
524 | if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { | |
525 | symtab_shndx_idx = i; | |
526 | info->symtab_shndx_start = (void *)hdr + | |
527 | sechdrs[i].sh_offset; | |
528 | info->symtab_shndx_stop = (void *)hdr + | |
529 | sechdrs[i].sh_offset + sechdrs[i].sh_size; | |
530 | } | |
1da177e4 | 531 | } |
df578e7d | 532 | if (!info->symtab_start) |
cb80514d | 533 | fatal("%s has no symtab?\n", filename); |
df578e7d | 534 | |
1da177e4 LT |
535 | /* Fix endianness in symbols */ |
536 | for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { | |
537 | sym->st_shndx = TO_NATIVE(sym->st_shndx); | |
538 | sym->st_name = TO_NATIVE(sym->st_name); | |
539 | sym->st_value = TO_NATIVE(sym->st_value); | |
540 | sym->st_size = TO_NATIVE(sym->st_size); | |
541 | } | |
1ce53adf DV |
542 | |
543 | if (symtab_shndx_idx != ~0U) { | |
544 | Elf32_Word *p; | |
6845756b | 545 | if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link) |
1ce53adf | 546 | fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n", |
6845756b | 547 | filename, sechdrs[symtab_shndx_idx].sh_link, |
1ce53adf DV |
548 | symtab_idx); |
549 | /* Fix endianness */ | |
550 | for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; | |
551 | p++) | |
552 | *p = TO_NATIVE(*p); | |
553 | } | |
554 | ||
85bd2fdd | 555 | return 1; |
1da177e4 LT |
556 | } |
557 | ||
5c3ead8c | 558 | static void parse_elf_finish(struct elf_info *info) |
1da177e4 LT |
559 | { |
560 | release_file(info->hdr, info->size); | |
561 | } | |
562 | ||
4d7365d6 SR |
563 | static int ignore_undef_symbol(struct elf_info *info, const char *symname) |
564 | { | |
565 | /* ignore __this_module, it will be resolved shortly */ | |
b92021b0 | 566 | if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0) |
4d7365d6 SR |
567 | return 1; |
568 | /* ignore global offset table */ | |
569 | if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) | |
570 | return 1; | |
571 | if (info->hdr->e_machine == EM_PPC) | |
572 | /* Special register function linked on all modules during final link of .ko */ | |
573 | if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 || | |
574 | strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 || | |
575 | strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 || | |
576 | strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0) | |
577 | return 1; | |
7fca5dc8 SR |
578 | if (info->hdr->e_machine == EM_PPC64) |
579 | /* Special register function linked on all modules during final link of .ko */ | |
580 | if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 || | |
581 | strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0) | |
582 | return 1; | |
4d7365d6 SR |
583 | /* Do not ignore this symbol */ |
584 | return 0; | |
585 | } | |
586 | ||
b92021b0 RR |
587 | #define CRC_PFX VMLINUX_SYMBOL_STR(__crc_) |
588 | #define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_) | |
1da177e4 | 589 | |
5c3ead8c SR |
590 | static void handle_modversions(struct module *mod, struct elf_info *info, |
591 | Elf_Sym *sym, const char *symname) | |
1da177e4 LT |
592 | { |
593 | unsigned int crc; | |
62a26356 AIB |
594 | enum export export; |
595 | ||
258f7426 FR |
596 | if ((!is_vmlinux(mod->name) || mod->is_dot_o) && |
597 | strncmp(symname, "__ksymtab", 9) == 0) | |
62a26356 AIB |
598 | export = export_from_secname(info, get_secindex(info, sym)); |
599 | else | |
600 | export = export_from_sec(info, get_secindex(info, sym)); | |
1da177e4 LT |
601 | |
602 | switch (sym->st_shndx) { | |
603 | case SHN_COMMON: | |
cb80514d | 604 | warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name); |
1da177e4 LT |
605 | break; |
606 | case SHN_ABS: | |
607 | /* CRC'd symbol */ | |
8d99513c | 608 | if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) { |
1da177e4 | 609 | crc = (unsigned int) sym->st_value; |
bd5cbced RP |
610 | sym_update_crc(symname + strlen(CRC_PFX), mod, crc, |
611 | export); | |
1da177e4 LT |
612 | } |
613 | break; | |
614 | case SHN_UNDEF: | |
615 | /* undefined symbol */ | |
616 | if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && | |
617 | ELF_ST_BIND(sym->st_info) != STB_WEAK) | |
618 | break; | |
4d7365d6 | 619 | if (ignore_undef_symbol(info, symname)) |
1da177e4 | 620 | break; |
8d529014 BC |
621 | /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ |
622 | #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) | |
623 | /* add compatibility with older glibc */ | |
624 | #ifndef STT_SPARC_REGISTER | |
625 | #define STT_SPARC_REGISTER STT_REGISTER | |
626 | #endif | |
1da177e4 LT |
627 | if (info->hdr->e_machine == EM_SPARC || |
628 | info->hdr->e_machine == EM_SPARCV9) { | |
629 | /* Ignore register directives. */ | |
8d529014 | 630 | if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4 | 631 | break; |
62070fa4 SR |
632 | if (symname[0] == '.') { |
633 | char *munged = strdup(symname); | |
634 | munged[0] = '_'; | |
635 | munged[1] = toupper(munged[1]); | |
636 | symname = munged; | |
637 | } | |
1da177e4 LT |
638 | } |
639 | #endif | |
62070fa4 | 640 | |
b92021b0 RR |
641 | #ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX |
642 | if (symname[0] != '_') | |
643 | break; | |
644 | else | |
645 | symname++; | |
646 | #endif | |
647 | mod->unres = alloc_symbol(symname, | |
648 | ELF_ST_BIND(sym->st_info) == STB_WEAK, | |
649 | mod->unres); | |
1da177e4 LT |
650 | break; |
651 | default: | |
652 | /* All exported symbols */ | |
8d99513c | 653 | if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) { |
bd5cbced RP |
654 | sym_add_exported(symname + strlen(KSYMTAB_PFX), mod, |
655 | export); | |
1da177e4 | 656 | } |
b92021b0 | 657 | if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0) |
1da177e4 | 658 | mod->has_init = 1; |
b92021b0 | 659 | if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0) |
1da177e4 LT |
660 | mod->has_cleanup = 1; |
661 | break; | |
662 | } | |
663 | } | |
664 | ||
5c3ead8c SR |
665 | /** |
666 | * Parse tag=value strings from .modinfo section | |
667 | **/ | |
1da177e4 LT |
668 | static char *next_string(char *string, unsigned long *secsize) |
669 | { | |
670 | /* Skip non-zero chars */ | |
671 | while (string[0]) { | |
672 | string++; | |
673 | if ((*secsize)-- <= 1) | |
674 | return NULL; | |
675 | } | |
676 | ||
677 | /* Skip any zero padding. */ | |
678 | while (!string[0]) { | |
679 | string++; | |
680 | if ((*secsize)-- <= 1) | |
681 | return NULL; | |
682 | } | |
683 | return string; | |
684 | } | |
685 | ||
b817f6fe SR |
686 | static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len, |
687 | const char *tag, char *info) | |
1da177e4 LT |
688 | { |
689 | char *p; | |
690 | unsigned int taglen = strlen(tag); | |
691 | unsigned long size = modinfo_len; | |
692 | ||
b817f6fe SR |
693 | if (info) { |
694 | size -= info - (char *)modinfo; | |
695 | modinfo = next_string(info, &size); | |
696 | } | |
697 | ||
1da177e4 LT |
698 | for (p = modinfo; p; p = next_string(p, &size)) { |
699 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') | |
700 | return p + taglen + 1; | |
701 | } | |
702 | return NULL; | |
703 | } | |
704 | ||
b817f6fe SR |
705 | static char *get_modinfo(void *modinfo, unsigned long modinfo_len, |
706 | const char *tag) | |
707 | ||
708 | { | |
709 | return get_next_modinfo(modinfo, modinfo_len, tag, NULL); | |
710 | } | |
711 | ||
4c8fbca5 SR |
712 | /** |
713 | * Test if string s ends in string sub | |
714 | * return 0 if match | |
715 | **/ | |
716 | static int strrcmp(const char *s, const char *sub) | |
717 | { | |
df578e7d | 718 | int slen, sublen; |
62070fa4 | 719 | |
4c8fbca5 SR |
720 | if (!s || !sub) |
721 | return 1; | |
62070fa4 | 722 | |
4c8fbca5 | 723 | slen = strlen(s); |
df578e7d | 724 | sublen = strlen(sub); |
62070fa4 | 725 | |
4c8fbca5 SR |
726 | if ((slen == 0) || (sublen == 0)) |
727 | return 1; | |
728 | ||
df578e7d SR |
729 | if (sublen > slen) |
730 | return 1; | |
4c8fbca5 | 731 | |
df578e7d | 732 | return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca5 SR |
733 | } |
734 | ||
ff13f926 SR |
735 | static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) |
736 | { | |
58fb0d4f SR |
737 | if (sym) |
738 | return elf->strtab + sym->st_name; | |
739 | else | |
f666751a | 740 | return "(unknown)"; |
ff13f926 SR |
741 | } |
742 | ||
1ce53adf | 743 | static const char *sec_name(struct elf_info *elf, int secindex) |
ff13f926 SR |
744 | { |
745 | Elf_Shdr *sechdrs = elf->sechdrs; | |
746 | return (void *)elf->hdr + | |
1ce53adf DV |
747 | elf->sechdrs[elf->secindex_strings].sh_offset + |
748 | sechdrs[secindex].sh_name; | |
ff13f926 SR |
749 | } |
750 | ||
751 | static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) | |
752 | { | |
753 | return (void *)elf->hdr + | |
1ce53adf DV |
754 | elf->sechdrs[elf->secindex_strings].sh_offset + |
755 | sechdr->sh_name; | |
ff13f926 SR |
756 | } |
757 | ||
10668220 SR |
758 | /* if sym is empty or point to a string |
759 | * like ".[0-9]+" then return 1. | |
760 | * This is the optional prefix added by ld to some sections | |
761 | */ | |
762 | static int number_prefix(const char *sym) | |
763 | { | |
764 | if (*sym++ == '\0') | |
765 | return 1; | |
766 | if (*sym != '.') | |
767 | return 0; | |
768 | do { | |
769 | char c = *sym++; | |
770 | if (c < '0' || c > '9') | |
771 | return 0; | |
772 | } while (*sym); | |
773 | return 1; | |
774 | } | |
775 | ||
776 | /* The pattern is an array of simple patterns. | |
777 | * "foo" will match an exact string equal to "foo" | |
6c5bd235 | 778 | * "*foo" will match a string that ends with "foo" |
10668220 SR |
779 | * "foo*" will match a string that begins with "foo" |
780 | * "foo$" will match a string equal to "foo" or "foo.1" | |
781 | * where the '1' can be any number including several digits. | |
782 | * The $ syntax is for sections where ld append a dot number | |
783 | * to make section name unique. | |
784 | */ | |
5c725138 | 785 | static int match(const char *sym, const char * const pat[]) |
10668220 SR |
786 | { |
787 | const char *p; | |
788 | while (*pat) { | |
789 | p = *pat++; | |
790 | const char *endp = p + strlen(p) - 1; | |
791 | ||
6c5bd235 SR |
792 | /* "*foo" */ |
793 | if (*p == '*') { | |
794 | if (strrcmp(sym, p + 1) == 0) | |
795 | return 1; | |
796 | } | |
10668220 | 797 | /* "foo*" */ |
6c5bd235 | 798 | else if (*endp == '*') { |
10668220 SR |
799 | if (strncmp(sym, p, strlen(p) - 1) == 0) |
800 | return 1; | |
801 | } | |
802 | /* "foo$" */ | |
803 | else if (*endp == '$') { | |
804 | if (strncmp(sym, p, strlen(p) - 1) == 0) { | |
805 | if (number_prefix(sym + strlen(p) - 1)) | |
806 | return 1; | |
807 | } | |
808 | } | |
809 | /* no wildcards */ | |
810 | else { | |
811 | if (strcmp(p, sym) == 0) | |
812 | return 1; | |
813 | } | |
814 | } | |
815 | /* no match */ | |
816 | return 0; | |
817 | } | |
818 | ||
10668220 SR |
819 | /* sections that we do not want to do full section mismatch check on */ |
820 | static const char *section_white_list[] = | |
4391ed6a SR |
821 | { |
822 | ".comment*", | |
823 | ".debug*", | |
1121584f | 824 | ".zdebug*", /* Compressed debug sections. */ |
019fca84 | 825 | ".GCC-command-line", /* mn10300 */ |
76b27645 | 826 | ".GCC.command.line", /* record-gcc-switches, non mn10300 */ |
4391ed6a SR |
827 | ".mdebug*", /* alpha, score, mips etc. */ |
828 | ".pdr", /* alpha, score, mips etc. */ | |
829 | ".stab*", | |
830 | ".note*", | |
831 | ".got*", | |
832 | ".toc*", | |
af42e970 MF |
833 | ".xt.prop", /* xtensa */ |
834 | ".xt.lit", /* xtensa */ | |
f2e207f3 VG |
835 | ".arcextmap*", /* arc */ |
836 | ".gnu.linkonce.arcext*", /* arc : modules */ | |
4391ed6a SR |
837 | NULL |
838 | }; | |
10668220 | 839 | |
e241a630 | 840 | /* |
b614a697 | 841 | * This is used to find sections missing the SHF_ALLOC flag. |
e241a630 | 842 | * The cause of this is often a section specified in assembler |
b614a697 | 843 | * without "ax" / "aw". |
e241a630 | 844 | */ |
b614a697 AK |
845 | static void check_section(const char *modname, struct elf_info *elf, |
846 | Elf_Shdr *sechdr) | |
e241a630 | 847 | { |
b614a697 AK |
848 | const char *sec = sech_name(elf, sechdr); |
849 | ||
850 | if (sechdr->sh_type == SHT_PROGBITS && | |
851 | !(sechdr->sh_flags & SHF_ALLOC) && | |
852 | !match(sec, section_white_list)) { | |
853 | warn("%s (%s): unexpected non-allocatable section.\n" | |
854 | "Did you forget to use \"ax\"/\"aw\" in a .S file?\n" | |
855 | "Note that for example <linux/init.h> contains\n" | |
856 | "section definitions for use in .S files.\n\n", | |
857 | modname, sec); | |
e241a630 | 858 | } |
e241a630 SR |
859 | } |
860 | ||
861 | ||
862 | ||
eb8f6890 | 863 | #define ALL_INIT_DATA_SECTIONS \ |
e24f6628 PG |
864 | ".init.setup$", ".init.rodata$", ".meminit.rodata$", \ |
865 | ".init.data$", ".meminit.data$" | |
eb8f6890 | 866 | #define ALL_EXIT_DATA_SECTIONS \ |
e24f6628 | 867 | ".exit.data$", ".memexit.data$" |
10668220 | 868 | |
eb8f6890 | 869 | #define ALL_INIT_TEXT_SECTIONS \ |
e24f6628 | 870 | ".init.text$", ".meminit.text$" |
eb8f6890 | 871 | #define ALL_EXIT_TEXT_SECTIONS \ |
e24f6628 | 872 | ".exit.text$", ".memexit.text$" |
10668220 | 873 | |
bb15d8db SAS |
874 | #define ALL_PCI_INIT_SECTIONS \ |
875 | ".pci_fixup_early$", ".pci_fixup_header$", ".pci_fixup_final$", \ | |
876 | ".pci_fixup_enable$", ".pci_fixup_resume$", \ | |
877 | ".pci_fixup_resume_early$", ".pci_fixup_suspend$" | |
878 | ||
e24f6628 PG |
879 | #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS |
880 | #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS | |
4a31a229 UKK |
881 | |
882 | #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS | |
883 | #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS | |
10668220 | 884 | |
6c5bd235 | 885 | #define DATA_SECTIONS ".data$", ".data.rel$" |
10668220 SR |
886 | #define TEXT_SECTIONS ".text$" |
887 | ||
fd6c3a8d | 888 | #define INIT_SECTIONS ".init.*" |
fd6c3a8d | 889 | #define MEM_INIT_SECTIONS ".meminit.*" |
eb8f6890 | 890 | |
fd6c3a8d | 891 | #define EXIT_SECTIONS ".exit.*" |
fd6c3a8d | 892 | #define MEM_EXIT_SECTIONS ".memexit.*" |
eb8f6890 | 893 | |
6c5bd235 | 894 | /* init data sections */ |
eb8f6890 | 895 | static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235 SR |
896 | |
897 | /* all init sections */ | |
eb8f6890 | 898 | static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235 SR |
899 | |
900 | /* All init and exit sections (code + data) */ | |
901 | static const char *init_exit_sections[] = | |
eb8f6890 | 902 | {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235 SR |
903 | |
904 | /* data section */ | |
905 | static const char *data_sections[] = { DATA_SECTIONS, NULL }; | |
906 | ||
6c5bd235 SR |
907 | |
908 | /* symbols in .data that may refer to init/exit sections */ | |
af92a82d UKK |
909 | #define DEFAULT_SYMBOL_WHITE_LIST \ |
910 | "*driver", \ | |
911 | "*_template", /* scsi uses *_template a lot */ \ | |
912 | "*_timer", /* arm uses ops structures named _timer a lot */ \ | |
913 | "*_sht", /* scsi also used *_sht to some extent */ \ | |
914 | "*_ops", \ | |
915 | "*_probe", \ | |
916 | "*_probe_one", \ | |
917 | "*_console" | |
6c5bd235 SR |
918 | |
919 | static const char *head_sections[] = { ".head.text*", NULL }; | |
920 | static const char *linker_symbols[] = | |
921 | { "__init_begin", "_sinittext", "_einittext", NULL }; | |
922 | ||
588ccd73 | 923 | enum mismatch { |
bbd3f4fb UKK |
924 | TEXT_TO_ANY_INIT, |
925 | DATA_TO_ANY_INIT, | |
926 | TEXT_TO_ANY_EXIT, | |
927 | DATA_TO_ANY_EXIT, | |
928 | XXXINIT_TO_SOME_INIT, | |
929 | XXXEXIT_TO_SOME_EXIT, | |
930 | ANY_INIT_TO_ANY_EXIT, | |
931 | ANY_EXIT_TO_ANY_INIT, | |
588ccd73 SR |
932 | EXPORT_TO_INIT_EXIT, |
933 | }; | |
934 | ||
10668220 SR |
935 | struct sectioncheck { |
936 | const char *fromsec[20]; | |
937 | const char *tosec[20]; | |
588ccd73 | 938 | enum mismatch mismatch; |
af92a82d | 939 | const char *symbol_white_list[20]; |
10668220 SR |
940 | }; |
941 | ||
942 | const struct sectioncheck sectioncheck[] = { | |
943 | /* Do not reference init/exit code/data from | |
944 | * normal code and data | |
945 | */ | |
946 | { | |
588ccd73 SR |
947 | .fromsec = { TEXT_SECTIONS, NULL }, |
948 | .tosec = { ALL_INIT_SECTIONS, NULL }, | |
bbd3f4fb | 949 | .mismatch = TEXT_TO_ANY_INIT, |
af92a82d | 950 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
951 | }, |
952 | { | |
953 | .fromsec = { DATA_SECTIONS, NULL }, | |
0db25245 | 954 | .tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb | 955 | .mismatch = DATA_TO_ANY_INIT, |
af92a82d | 956 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 | 957 | }, |
0db25245 UKK |
958 | { |
959 | .fromsec = { DATA_SECTIONS, NULL }, | |
960 | .tosec = { INIT_SECTIONS, NULL }, | |
961 | .mismatch = DATA_TO_ANY_INIT, | |
962 | .symbol_white_list = { | |
963 | "*_template", "*_timer", "*_sht", "*_ops", | |
964 | "*_probe", "*_probe_one", "*_console", NULL | |
965 | }, | |
966 | }, | |
588ccd73 SR |
967 | { |
968 | .fromsec = { TEXT_SECTIONS, NULL }, | |
969 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 970 | .mismatch = TEXT_TO_ANY_EXIT, |
af92a82d | 971 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd73 SR |
972 | }, |
973 | { | |
974 | .fromsec = { DATA_SECTIONS, NULL }, | |
975 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 976 | .mismatch = DATA_TO_ANY_EXIT, |
af92a82d | 977 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 978 | }, |
e24f6628 | 979 | /* Do not reference init code/data from meminit code/data */ |
eb8f6890 | 980 | { |
4a31a229 | 981 | .fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
588ccd73 | 982 | .tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb | 983 | .mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d | 984 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f6890 | 985 | }, |
e24f6628 | 986 | /* Do not reference exit code/data from memexit code/data */ |
eb8f6890 | 987 | { |
4a31a229 | 988 | .fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
588ccd73 | 989 | .tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb | 990 | .mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d | 991 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
992 | }, |
993 | /* Do not use exit code/data from init code */ | |
994 | { | |
eb8f6890 SR |
995 | .fromsec = { ALL_INIT_SECTIONS, NULL }, |
996 | .tosec = { ALL_EXIT_SECTIONS, NULL }, | |
bbd3f4fb | 997 | .mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d | 998 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 SR |
999 | }, |
1000 | /* Do not use init code/data from exit code */ | |
1001 | { | |
eb8f6890 | 1002 | .fromsec = { ALL_EXIT_SECTIONS, NULL }, |
588ccd73 | 1003 | .tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb | 1004 | .mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d | 1005 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220 | 1006 | }, |
bb15d8db SAS |
1007 | { |
1008 | .fromsec = { ALL_PCI_INIT_SECTIONS, NULL }, | |
1009 | .tosec = { INIT_SECTIONS, NULL }, | |
1010 | .mismatch = ANY_INIT_TO_ANY_EXIT, | |
1011 | .symbol_white_list = { NULL }, | |
1012 | }, | |
10668220 SR |
1013 | /* Do not export init/exit functions or data */ |
1014 | { | |
1015 | .fromsec = { "__ksymtab*", NULL }, | |
fa95eb1f | 1016 | .tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d UKK |
1017 | .mismatch = EXPORT_TO_INIT_EXIT, |
1018 | .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, | |
10668220 SR |
1019 | } |
1020 | }; | |
1021 | ||
0d2a636e UKK |
1022 | static const struct sectioncheck *section_mismatch( |
1023 | const char *fromsec, const char *tosec) | |
10668220 SR |
1024 | { |
1025 | int i; | |
1026 | int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); | |
1027 | const struct sectioncheck *check = §ioncheck[0]; | |
1028 | ||
1029 | for (i = 0; i < elems; i++) { | |
1030 | if (match(fromsec, check->fromsec) && | |
1031 | match(tosec, check->tosec)) | |
0d2a636e | 1032 | return check; |
10668220 SR |
1033 | check++; |
1034 | } | |
0d2a636e | 1035 | return NULL; |
10668220 SR |
1036 | } |
1037 | ||
4c8fbca5 SR |
1038 | /** |
1039 | * Whitelist to allow certain references to pass with no warning. | |
0e0d314e | 1040 | * |
4c8fbca5 SR |
1041 | * Pattern 1: |
1042 | * If a module parameter is declared __initdata and permissions=0 | |
1043 | * then this is legal despite the warning generated. | |
1044 | * We cannot see value of permissions here, so just ignore | |
1045 | * this pattern. | |
1046 | * The pattern is identified by: | |
1047 | * tosec = .init.data | |
9209aed0 | 1048 | * fromsec = .data* |
4c8fbca5 | 1049 | * atsym =__param* |
62070fa4 | 1050 | * |
6a841528 RR |
1051 | * Pattern 1a: |
1052 | * module_param_call() ops can refer to __init set function if permissions=0 | |
1053 | * The pattern is identified by: | |
1054 | * tosec = .init.text | |
1055 | * fromsec = .data* | |
1056 | * atsym = __param_ops_* | |
1057 | * | |
4c8fbca5 | 1058 | * Pattern 2: |
72ee59b5 | 1059 | * Many drivers utilise a *driver container with references to |
4c8fbca5 | 1060 | * add, remove, probe functions etc. |
4c8fbca5 | 1061 | * the pattern is identified by: |
83cda2bb SR |
1062 | * tosec = init or exit section |
1063 | * fromsec = data section | |
df578e7d SR |
1064 | * atsym = *driver, *_template, *_sht, *_ops, *_probe, |
1065 | * *probe_one, *_console, *_timer | |
ee6a8545 VG |
1066 | * |
1067 | * Pattern 3: | |
c993971f | 1068 | * Whitelist all references from .head.text to any init section |
9bf8cb9b | 1069 | * |
1d8af559 | 1070 | * Pattern 4: |
ee6a8545 VG |
1071 | * Some symbols belong to init section but still it is ok to reference |
1072 | * these from non-init sections as these symbols don't have any memory | |
1073 | * allocated for them and symbol address and value are same. So even | |
1074 | * if init section is freed, its ok to reference those symbols. | |
1075 | * For ex. symbols marking the init section boundaries. | |
1076 | * This pattern is identified by | |
1077 | * refsymname = __init_begin, _sinittext, _einittext | |
9bf8cb9b | 1078 | * |
4c8fbca5 | 1079 | **/ |
af92a82d UKK |
1080 | static int secref_whitelist(const struct sectioncheck *mismatch, |
1081 | const char *fromsec, const char *fromsym, | |
58fb0d4f | 1082 | const char *tosec, const char *tosym) |
4c8fbca5 | 1083 | { |
4c8fbca5 | 1084 | /* Check for pattern 1 */ |
6c5bd235 SR |
1085 | if (match(tosec, init_data_sections) && |
1086 | match(fromsec, data_sections) && | |
58fb0d4f SR |
1087 | (strncmp(fromsym, "__param", strlen("__param")) == 0)) |
1088 | return 0; | |
4c8fbca5 | 1089 | |
6a841528 RR |
1090 | /* Check for pattern 1a */ |
1091 | if (strcmp(tosec, ".init.text") == 0 && | |
1092 | match(fromsec, data_sections) && | |
1093 | (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0)) | |
1094 | return 0; | |
1095 | ||
4c8fbca5 | 1096 | /* Check for pattern 2 */ |
6c5bd235 SR |
1097 | if (match(tosec, init_exit_sections) && |
1098 | match(fromsec, data_sections) && | |
af92a82d | 1099 | match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f | 1100 | return 0; |
4c8fbca5 | 1101 | |
9bf8cb9b | 1102 | /* Check for pattern 3 */ |
6c5bd235 SR |
1103 | if (match(fromsec, head_sections) && |
1104 | match(tosec, init_sections)) | |
58fb0d4f | 1105 | return 0; |
9bf8cb9b | 1106 | |
1d8af559 | 1107 | /* Check for pattern 4 */ |
58fb0d4f SR |
1108 | if (match(tosym, linker_symbols)) |
1109 | return 0; | |
9bf8cb9b | 1110 | |
58fb0d4f | 1111 | return 1; |
4c8fbca5 SR |
1112 | } |
1113 | ||
93684d3b SR |
1114 | /** |
1115 | * Find symbol based on relocation record info. | |
1116 | * In some cases the symbol supplied is a valid symbol so | |
1117 | * return refsym. If st_name != 0 we assume this is a valid symbol. | |
1118 | * In other cases the symbol needs to be looked up in the symbol table | |
1119 | * based on section and address. | |
1120 | * **/ | |
9ad21c3f | 1121 | static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b SR |
1122 | Elf_Sym *relsym) |
1123 | { | |
1124 | Elf_Sym *sym; | |
9ad21c3f SR |
1125 | Elf_Sym *near = NULL; |
1126 | Elf64_Sword distance = 20; | |
1127 | Elf64_Sword d; | |
1ce53adf | 1128 | unsigned int relsym_secindex; |
93684d3b SR |
1129 | |
1130 | if (relsym->st_name != 0) | |
1131 | return relsym; | |
1ce53adf DV |
1132 | |
1133 | relsym_secindex = get_secindex(elf, relsym); | |
93684d3b | 1134 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf | 1135 | if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b | 1136 | continue; |
ae4ac123 AN |
1137 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) |
1138 | continue; | |
93684d3b SR |
1139 | if (sym->st_value == addr) |
1140 | return sym; | |
9ad21c3f SR |
1141 | /* Find a symbol nearby - addr are maybe negative */ |
1142 | d = sym->st_value - addr; | |
1143 | if (d < 0) | |
1144 | d = addr - sym->st_value; | |
1145 | if (d < distance) { | |
1146 | distance = d; | |
1147 | near = sym; | |
1148 | } | |
93684d3b | 1149 | } |
9ad21c3f SR |
1150 | /* We need a close match */ |
1151 | if (distance < 20) | |
1152 | return near; | |
1153 | else | |
1154 | return NULL; | |
93684d3b SR |
1155 | } |
1156 | ||
da68d61f DB |
1157 | static inline int is_arm_mapping_symbol(const char *str) |
1158 | { | |
1159 | return str[0] == '$' && strchr("atd", str[1]) | |
1160 | && (str[2] == '\0' || str[2] == '.'); | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * If there's no name there, ignore it; likewise, ignore it if it's | |
1165 | * one of the magic symbols emitted used by current ARM tools. | |
1166 | * | |
1167 | * Otherwise if find_symbols_between() returns those symbols, they'll | |
1168 | * fail the whitelist tests and cause lots of false alarms ... fixable | |
1169 | * only by merging __exit and __init sections into __text, bloating | |
1170 | * the kernel (which is especially evil on embedded platforms). | |
1171 | */ | |
1172 | static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) | |
1173 | { | |
1174 | const char *name = elf->strtab + sym->st_name; | |
1175 | ||
1176 | if (!name || !strlen(name)) | |
1177 | return 0; | |
1178 | return !is_arm_mapping_symbol(name); | |
1179 | } | |
1180 | ||
b39927cf | 1181 | /* |
43c74d17 SR |
1182 | * Find symbols before or equal addr and after addr - in the section sec. |
1183 | * If we find two symbols with equal offset prefer one with a valid name. | |
1184 | * The ELF format may have a better way to detect what type of symbol | |
1185 | * it is, but this works for now. | |
b39927cf | 1186 | **/ |
157c23c8 SR |
1187 | static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, |
1188 | const char *sec) | |
b39927cf SR |
1189 | { |
1190 | Elf_Sym *sym; | |
157c23c8 | 1191 | Elf_Sym *near = NULL; |
157c23c8 | 1192 | Elf_Addr distance = ~0; |
62070fa4 | 1193 | |
b39927cf SR |
1194 | for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1195 | const char *symsec; | |
1196 | ||
1ce53adf | 1197 | if (is_shndx_special(sym->st_shndx)) |
b39927cf | 1198 | continue; |
1ce53adf | 1199 | symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf SR |
1200 | if (strcmp(symsec, sec) != 0) |
1201 | continue; | |
da68d61f DB |
1202 | if (!is_valid_name(elf, sym)) |
1203 | continue; | |
b39927cf | 1204 | if (sym->st_value <= addr) { |
157c23c8 SR |
1205 | if ((addr - sym->st_value) < distance) { |
1206 | distance = addr - sym->st_value; | |
1207 | near = sym; | |
1208 | } else if ((addr - sym->st_value) == distance) { | |
1209 | near = sym; | |
43c74d17 | 1210 | } |
b39927cf SR |
1211 | } |
1212 | } | |
157c23c8 | 1213 | return near; |
b39927cf SR |
1214 | } |
1215 | ||
588ccd73 SR |
1216 | /* |
1217 | * Convert a section name to the function/data attribute | |
1218 | * .init.text => __init | |
588ccd73 SR |
1219 | * .memexitconst => __memconst |
1220 | * etc. | |
cbcf14a9 AS |
1221 | * |
1222 | * The memory of returned value has been allocated on a heap. The user of this | |
1223 | * method should free it after usage. | |
588ccd73 SR |
1224 | */ |
1225 | static char *sec2annotation(const char *s) | |
1226 | { | |
1227 | if (match(s, init_exit_sections)) { | |
1228 | char *p = malloc(20); | |
1229 | char *r = p; | |
1230 | ||
1231 | *p++ = '_'; | |
1232 | *p++ = '_'; | |
1233 | if (*s == '.') | |
1234 | s++; | |
1235 | while (*s && *s != '.') | |
1236 | *p++ = *s++; | |
1237 | *p = '\0'; | |
1238 | if (*s == '.') | |
1239 | s++; | |
1240 | if (strstr(s, "rodata") != NULL) | |
1241 | strcat(p, "const "); | |
1242 | else if (strstr(s, "data") != NULL) | |
1243 | strcat(p, "data "); | |
1244 | else | |
1245 | strcat(p, " "); | |
cbcf14a9 | 1246 | return r; |
588ccd73 | 1247 | } else { |
5003bab8 | 1248 | return strdup(""); |
588ccd73 SR |
1249 | } |
1250 | } | |
1251 | ||
1252 | static int is_function(Elf_Sym *sym) | |
1253 | { | |
1254 | if (sym) | |
1255 | return ELF_ST_TYPE(sym->st_info) == STT_FUNC; | |
1256 | else | |
f666751a | 1257 | return -1; |
588ccd73 SR |
1258 | } |
1259 | ||
00759c0e RD |
1260 | static void print_section_list(const char * const list[20]) |
1261 | { | |
1262 | const char *const *s = list; | |
1263 | ||
1264 | while (*s) { | |
1265 | fprintf(stderr, "%s", *s); | |
1266 | s++; | |
1267 | if (*s) | |
1268 | fprintf(stderr, ", "); | |
1269 | } | |
1270 | fprintf(stderr, "\n"); | |
1271 | } | |
1272 | ||
58fb0d4f | 1273 | /* |
b39927cf SR |
1274 | * Print a warning about a section mismatch. |
1275 | * Try to find symbols near it so user can find it. | |
4c8fbca5 | 1276 | * Check whitelist before warning - it may be a false positive. |
58fb0d4f | 1277 | */ |
0d2a636e UKK |
1278 | static void report_sec_mismatch(const char *modname, |
1279 | const struct sectioncheck *mismatch, | |
58fb0d4f SR |
1280 | const char *fromsec, |
1281 | unsigned long long fromaddr, | |
1282 | const char *fromsym, | |
588ccd73 SR |
1283 | int from_is_func, |
1284 | const char *tosec, const char *tosym, | |
1285 | int to_is_func) | |
1286 | { | |
1287 | const char *from, *from_p; | |
1288 | const char *to, *to_p; | |
37ed19d5 AF |
1289 | char *prl_from; |
1290 | char *prl_to; | |
f666751a SR |
1291 | |
1292 | switch (from_is_func) { | |
1293 | case 0: from = "variable"; from_p = ""; break; | |
1294 | case 1: from = "function"; from_p = "()"; break; | |
1295 | default: from = "(unknown reference)"; from_p = ""; break; | |
1296 | } | |
1297 | switch (to_is_func) { | |
1298 | case 0: to = "variable"; to_p = ""; break; | |
1299 | case 1: to = "function"; to_p = "()"; break; | |
1300 | default: to = "(unknown reference)"; to_p = ""; break; | |
1301 | } | |
588ccd73 | 1302 | |
e5f95c8b SR |
1303 | sec_mismatch_count++; |
1304 | if (!sec_mismatch_verbose) | |
1305 | return; | |
1306 | ||
7c0ac495 GU |
1307 | warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " |
1308 | "to the %s %s:%s%s\n", | |
1309 | modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, | |
1310 | tosym, to_p); | |
588ccd73 | 1311 | |
0d2a636e | 1312 | switch (mismatch->mismatch) { |
bbd3f4fb | 1313 | case TEXT_TO_ANY_INIT: |
37ed19d5 AF |
1314 | prl_from = sec2annotation(fromsec); |
1315 | prl_to = sec2annotation(tosec); | |
588ccd73 | 1316 | fprintf(stderr, |
f666751a | 1317 | "The function %s%s() references\n" |
588ccd73 SR |
1318 | "the %s %s%s%s.\n" |
1319 | "This is often because %s lacks a %s\n" | |
1320 | "annotation or the annotation of %s is wrong.\n", | |
37ed19d5 AF |
1321 | prl_from, fromsym, |
1322 | to, prl_to, tosym, to_p, | |
1323 | fromsym, prl_to, tosym); | |
1324 | free(prl_from); | |
1325 | free(prl_to); | |
588ccd73 | 1326 | break; |
bbd3f4fb | 1327 | case DATA_TO_ANY_INIT: { |
37ed19d5 | 1328 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1329 | fprintf(stderr, |
1330 | "The variable %s references\n" | |
1331 | "the %s %s%s%s\n" | |
1332 | "If the reference is valid then annotate the\n" | |
8b8b76c0 | 1333 | "variable with __init* or __refdata (see linux/init.h) " |
588ccd73 | 1334 | "or name the variable:\n", |
37ed19d5 | 1335 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1336 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1337 | free(prl_to); |
588ccd73 | 1338 | break; |
58fb0d4f | 1339 | } |
bbd3f4fb | 1340 | case TEXT_TO_ANY_EXIT: |
37ed19d5 | 1341 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1342 | fprintf(stderr, |
1343 | "The function %s() references a %s in an exit section.\n" | |
1344 | "Often the %s %s%s has valid usage outside the exit section\n" | |
1345 | "and the fix is to remove the %sannotation of %s.\n", | |
37ed19d5 AF |
1346 | fromsym, to, to, tosym, to_p, prl_to, tosym); |
1347 | free(prl_to); | |
588ccd73 | 1348 | break; |
bbd3f4fb | 1349 | case DATA_TO_ANY_EXIT: { |
37ed19d5 | 1350 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1351 | fprintf(stderr, |
1352 | "The variable %s references\n" | |
1353 | "the %s %s%s%s\n" | |
1354 | "If the reference is valid then annotate the\n" | |
1355 | "variable with __exit* (see linux/init.h) or " | |
1356 | "name the variable:\n", | |
37ed19d5 | 1357 | fromsym, to, prl_to, tosym, to_p); |
00759c0e | 1358 | print_section_list(mismatch->symbol_white_list); |
37ed19d5 | 1359 | free(prl_to); |
588ccd73 SR |
1360 | break; |
1361 | } | |
bbd3f4fb UKK |
1362 | case XXXINIT_TO_SOME_INIT: |
1363 | case XXXEXIT_TO_SOME_EXIT: | |
37ed19d5 AF |
1364 | prl_from = sec2annotation(fromsec); |
1365 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1366 | fprintf(stderr, |
1367 | "The %s %s%s%s references\n" | |
1368 | "a %s %s%s%s.\n" | |
1369 | "If %s is only used by %s then\n" | |
1370 | "annotate %s with a matching annotation.\n", | |
37ed19d5 AF |
1371 | from, prl_from, fromsym, from_p, |
1372 | to, prl_to, tosym, to_p, | |
b1d2675a | 1373 | tosym, fromsym, tosym); |
37ed19d5 AF |
1374 | free(prl_from); |
1375 | free(prl_to); | |
588ccd73 | 1376 | break; |
bbd3f4fb | 1377 | case ANY_INIT_TO_ANY_EXIT: |
37ed19d5 AF |
1378 | prl_from = sec2annotation(fromsec); |
1379 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1380 | fprintf(stderr, |
1381 | "The %s %s%s%s references\n" | |
1382 | "a %s %s%s%s.\n" | |
1383 | "This is often seen when error handling " | |
1384 | "in the init function\n" | |
1385 | "uses functionality in the exit path.\n" | |
1386 | "The fix is often to remove the %sannotation of\n" | |
1387 | "%s%s so it may be used outside an exit section.\n", | |
37ed19d5 AF |
1388 | from, prl_from, fromsym, from_p, |
1389 | to, prl_to, tosym, to_p, | |
5003bab8 | 1390 | prl_to, tosym, to_p); |
37ed19d5 AF |
1391 | free(prl_from); |
1392 | free(prl_to); | |
588ccd73 | 1393 | break; |
bbd3f4fb | 1394 | case ANY_EXIT_TO_ANY_INIT: |
37ed19d5 AF |
1395 | prl_from = sec2annotation(fromsec); |
1396 | prl_to = sec2annotation(tosec); | |
588ccd73 SR |
1397 | fprintf(stderr, |
1398 | "The %s %s%s%s references\n" | |
1399 | "a %s %s%s%s.\n" | |
1400 | "This is often seen when error handling " | |
1401 | "in the exit function\n" | |
1402 | "uses functionality in the init path.\n" | |
1403 | "The fix is often to remove the %sannotation of\n" | |
1404 | "%s%s so it may be used outside an init section.\n", | |
37ed19d5 AF |
1405 | from, prl_from, fromsym, from_p, |
1406 | to, prl_to, tosym, to_p, | |
1407 | prl_to, tosym, to_p); | |
1408 | free(prl_from); | |
1409 | free(prl_to); | |
588ccd73 SR |
1410 | break; |
1411 | case EXPORT_TO_INIT_EXIT: | |
37ed19d5 | 1412 | prl_to = sec2annotation(tosec); |
588ccd73 SR |
1413 | fprintf(stderr, |
1414 | "The symbol %s is exported and annotated %s\n" | |
1415 | "Fix this by removing the %sannotation of %s " | |
1416 | "or drop the export.\n", | |
37ed19d5 AF |
1417 | tosym, prl_to, prl_to, tosym); |
1418 | free(prl_to); | |
588ccd73 SR |
1419 | break; |
1420 | } | |
1421 | fprintf(stderr, "\n"); | |
58fb0d4f SR |
1422 | } |
1423 | ||
1424 | static void check_section_mismatch(const char *modname, struct elf_info *elf, | |
1425 | Elf_Rela *r, Elf_Sym *sym, const char *fromsec) | |
1426 | { | |
1427 | const char *tosec; | |
0d2a636e | 1428 | const struct sectioncheck *mismatch; |
58fb0d4f | 1429 | |
1ce53adf | 1430 | tosec = sec_name(elf, get_secindex(elf, sym)); |
588ccd73 | 1431 | mismatch = section_mismatch(fromsec, tosec); |
0d2a636e | 1432 | if (mismatch) { |
588ccd73 SR |
1433 | Elf_Sym *to; |
1434 | Elf_Sym *from; | |
58fb0d4f | 1435 | const char *tosym; |
588ccd73 | 1436 | const char *fromsym; |
58fb0d4f | 1437 | |
588ccd73 SR |
1438 | from = find_elf_symbol2(elf, r->r_offset, fromsec); |
1439 | fromsym = sym_name(elf, from); | |
1440 | to = find_elf_symbol(elf, r->r_addend, sym); | |
1441 | tosym = sym_name(elf, to); | |
58fb0d4f SR |
1442 | |
1443 | /* check whitelist - we may ignore it */ | |
af92a82d UKK |
1444 | if (secref_whitelist(mismatch, |
1445 | fromsec, fromsym, tosec, tosym)) { | |
588ccd73 SR |
1446 | report_sec_mismatch(modname, mismatch, |
1447 | fromsec, r->r_offset, fromsym, | |
1448 | is_function(from), tosec, tosym, | |
1449 | is_function(to)); | |
58fb0d4f | 1450 | } |
b39927cf SR |
1451 | } |
1452 | } | |
1453 | ||
ae4ac123 | 1454 | static unsigned int *reloc_location(struct elf_info *elf, |
5b24c071 | 1455 | Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1456 | { |
1457 | Elf_Shdr *sechdrs = elf->sechdrs; | |
6845756b | 1458 | int section = sechdr->sh_info; |
ae4ac123 AN |
1459 | |
1460 | return (void *)elf->hdr + sechdrs[section].sh_offset + | |
731ece41 | 1461 | r->r_offset; |
ae4ac123 AN |
1462 | } |
1463 | ||
5b24c071 | 1464 | static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1465 | { |
1466 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1467 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1468 | |
1469 | switch (r_typ) { | |
1470 | case R_386_32: | |
1471 | r->r_addend = TO_NATIVE(*location); | |
1472 | break; | |
1473 | case R_386_PC32: | |
1474 | r->r_addend = TO_NATIVE(*location) + 4; | |
1475 | /* For CONFIG_RELOCATABLE=y */ | |
1476 | if (elf->hdr->e_type == ET_EXEC) | |
1477 | r->r_addend += r->r_offset; | |
1478 | break; | |
1479 | } | |
1480 | return 0; | |
1481 | } | |
1482 | ||
6e2e340b TL |
1483 | #ifndef R_ARM_CALL |
1484 | #define R_ARM_CALL 28 | |
1485 | #endif | |
1486 | #ifndef R_ARM_JUMP24 | |
1487 | #define R_ARM_JUMP24 29 | |
1488 | #endif | |
1489 | ||
5b24c071 | 1490 | static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa SR |
1491 | { |
1492 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
1493 | ||
1494 | switch (r_typ) { | |
1495 | case R_ARM_ABS32: | |
1496 | /* From ARM ABI: (S + A) | T */ | |
df578e7d SR |
1497 | r->r_addend = (int)(long) |
1498 | (elf->symtab_start + ELF_R_SYM(r->r_info)); | |
56a974fa SR |
1499 | break; |
1500 | case R_ARM_PC24: | |
6e2e340b TL |
1501 | case R_ARM_CALL: |
1502 | case R_ARM_JUMP24: | |
56a974fa | 1503 | /* From ARM ABI: ((S + A) | T) - P */ |
df578e7d | 1504 | r->r_addend = (int)(long)(elf->hdr + |
5b24c071 SR |
1505 | sechdr->sh_offset + |
1506 | (r->r_offset - sechdr->sh_addr)); | |
56a974fa SR |
1507 | break; |
1508 | default: | |
1509 | return 1; | |
1510 | } | |
1511 | return 0; | |
1512 | } | |
1513 | ||
5b24c071 | 1514 | static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac123 AN |
1515 | { |
1516 | unsigned int r_typ = ELF_R_TYPE(r->r_info); | |
5b24c071 | 1517 | unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac123 AN |
1518 | unsigned int inst; |
1519 | ||
1520 | if (r_typ == R_MIPS_HI16) | |
1521 | return 1; /* skip this */ | |
1522 | inst = TO_NATIVE(*location); | |
1523 | switch (r_typ) { | |
1524 | case R_MIPS_LO16: | |
1525 | r->r_addend = inst & 0xffff; | |
1526 | break; | |
1527 | case R_MIPS_26: | |
1528 | r->r_addend = (inst & 0x03ffffff) << 2; | |
1529 | break; | |
1530 | case R_MIPS_32: | |
1531 | r->r_addend = inst; | |
1532 | break; | |
1533 | } | |
1534 | return 0; | |
1535 | } | |
1536 | ||
5b24c071 | 1537 | static void section_rela(const char *modname, struct elf_info *elf, |
10668220 | 1538 | Elf_Shdr *sechdr) |
5b24c071 SR |
1539 | { |
1540 | Elf_Sym *sym; | |
1541 | Elf_Rela *rela; | |
1542 | Elf_Rela r; | |
1543 | unsigned int r_sym; | |
1544 | const char *fromsec; | |
5b24c071 | 1545 | |
ff13f926 | 1546 | Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1547 | Elf_Rela *stop = (void *)start + sechdr->sh_size; |
1548 | ||
ff13f926 | 1549 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1550 | fromsec += strlen(".rela"); |
1551 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1552 | if (match(fromsec, section_white_list)) |
5b24c071 | 1553 | return; |
e241a630 | 1554 | |
5b24c071 SR |
1555 | for (rela = start; rela < stop; rela++) { |
1556 | r.r_offset = TO_NATIVE(rela->r_offset); | |
1557 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1558 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1559 | unsigned int r_typ; |
1560 | r_sym = ELF64_MIPS_R_SYM(rela->r_info); | |
1561 | r_sym = TO_NATIVE(r_sym); | |
1562 | r_typ = ELF64_MIPS_R_TYPE(rela->r_info); | |
1563 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1564 | } else { | |
1565 | r.r_info = TO_NATIVE(rela->r_info); | |
1566 | r_sym = ELF_R_SYM(r.r_info); | |
1567 | } | |
1568 | #else | |
1569 | r.r_info = TO_NATIVE(rela->r_info); | |
1570 | r_sym = ELF_R_SYM(r.r_info); | |
1571 | #endif | |
1572 | r.r_addend = TO_NATIVE(rela->r_addend); | |
1573 | sym = elf->symtab_start + r_sym; | |
1574 | /* Skip special sections */ | |
1ce53adf | 1575 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1576 | continue; |
58fb0d4f | 1577 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1578 | } |
1579 | } | |
1580 | ||
1581 | static void section_rel(const char *modname, struct elf_info *elf, | |
10668220 | 1582 | Elf_Shdr *sechdr) |
5b24c071 SR |
1583 | { |
1584 | Elf_Sym *sym; | |
1585 | Elf_Rel *rel; | |
1586 | Elf_Rela r; | |
1587 | unsigned int r_sym; | |
1588 | const char *fromsec; | |
5b24c071 | 1589 | |
ff13f926 | 1590 | Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c071 SR |
1591 | Elf_Rel *stop = (void *)start + sechdr->sh_size; |
1592 | ||
ff13f926 | 1593 | fromsec = sech_name(elf, sechdr); |
5b24c071 SR |
1594 | fromsec += strlen(".rel"); |
1595 | /* if from section (name) is know good then skip it */ | |
b614a697 | 1596 | if (match(fromsec, section_white_list)) |
5b24c071 SR |
1597 | return; |
1598 | ||
1599 | for (rel = start; rel < stop; rel++) { | |
1600 | r.r_offset = TO_NATIVE(rel->r_offset); | |
1601 | #if KERNEL_ELFCLASS == ELFCLASS64 | |
ff13f926 | 1602 | if (elf->hdr->e_machine == EM_MIPS) { |
5b24c071 SR |
1603 | unsigned int r_typ; |
1604 | r_sym = ELF64_MIPS_R_SYM(rel->r_info); | |
1605 | r_sym = TO_NATIVE(r_sym); | |
1606 | r_typ = ELF64_MIPS_R_TYPE(rel->r_info); | |
1607 | r.r_info = ELF64_R_INFO(r_sym, r_typ); | |
1608 | } else { | |
1609 | r.r_info = TO_NATIVE(rel->r_info); | |
1610 | r_sym = ELF_R_SYM(r.r_info); | |
1611 | } | |
1612 | #else | |
1613 | r.r_info = TO_NATIVE(rel->r_info); | |
1614 | r_sym = ELF_R_SYM(r.r_info); | |
1615 | #endif | |
1616 | r.r_addend = 0; | |
ff13f926 | 1617 | switch (elf->hdr->e_machine) { |
5b24c071 SR |
1618 | case EM_386: |
1619 | if (addend_386_rel(elf, sechdr, &r)) | |
1620 | continue; | |
1621 | break; | |
1622 | case EM_ARM: | |
1623 | if (addend_arm_rel(elf, sechdr, &r)) | |
1624 | continue; | |
1625 | break; | |
1626 | case EM_MIPS: | |
1627 | if (addend_mips_rel(elf, sechdr, &r)) | |
1628 | continue; | |
1629 | break; | |
1630 | } | |
1631 | sym = elf->symtab_start + r_sym; | |
1632 | /* Skip special sections */ | |
1ce53adf | 1633 | if (is_shndx_special(sym->st_shndx)) |
5b24c071 | 1634 | continue; |
58fb0d4f | 1635 | check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c071 SR |
1636 | } |
1637 | } | |
1638 | ||
b39927cf SR |
1639 | /** |
1640 | * A module includes a number of sections that are discarded | |
1641 | * either when loaded or when used as built-in. | |
1642 | * For loaded modules all functions marked __init and all data | |
b595076a | 1643 | * marked __initdata will be discarded when the module has been initialized. |
b39927cf SR |
1644 | * Likewise for modules used built-in the sections marked __exit |
1645 | * are discarded because __exit marked function are supposed to be called | |
32be1d22 | 1646 | * only when a module is unloaded which never happens for built-in modules. |
b39927cf SR |
1647 | * The check_sec_ref() function traverses all relocation records |
1648 | * to find all references to a section that reference a section that will | |
1649 | * be discarded and warns about it. | |
1650 | **/ | |
1651 | static void check_sec_ref(struct module *mod, const char *modname, | |
10668220 | 1652 | struct elf_info *elf) |
b39927cf SR |
1653 | { |
1654 | int i; | |
b39927cf | 1655 | Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa4 | 1656 | |
b39927cf | 1657 | /* Walk through all sections */ |
1ce53adf | 1658 | for (i = 0; i < elf->num_sections; i++) { |
b614a697 | 1659 | check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf | 1660 | /* We want to process only relocation sections and not .init */ |
5b24c071 | 1661 | if (sechdrs[i].sh_type == SHT_RELA) |
10668220 | 1662 | section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c071 | 1663 | else if (sechdrs[i].sh_type == SHT_REL) |
10668220 | 1664 | section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf SR |
1665 | } |
1666 | } | |
1667 | ||
5c3ead8c | 1668 | static void read_symbols(char *modname) |
1da177e4 LT |
1669 | { |
1670 | const char *symname; | |
1671 | char *version; | |
b817f6fe | 1672 | char *license; |
1da177e4 LT |
1673 | struct module *mod; |
1674 | struct elf_info info = { }; | |
1675 | Elf_Sym *sym; | |
1676 | ||
85bd2fdd SR |
1677 | if (!parse_elf(&info, modname)) |
1678 | return; | |
1da177e4 LT |
1679 | |
1680 | mod = new_module(modname); | |
1681 | ||
1682 | /* When there's no vmlinux, don't print warnings about | |
1683 | * unresolved symbols (since there'll be too many ;) */ | |
1684 | if (is_vmlinux(modname)) { | |
1da177e4 | 1685 | have_vmlinux = 1; |
1da177e4 LT |
1686 | mod->skip = 1; |
1687 | } | |
1688 | ||
b817f6fe | 1689 | license = get_modinfo(info.modinfo, info.modinfo_len, "license"); |
2fa36568 SR |
1690 | if (info.modinfo && !license && !is_vmlinux(modname)) |
1691 | warn("modpost: missing MODULE_LICENSE() in %s\n" | |
1692 | "see include/linux/module.h for " | |
1693 | "more information\n", modname); | |
b817f6fe SR |
1694 | while (license) { |
1695 | if (license_is_gpl_compatible(license)) | |
1696 | mod->gpl_compatible = 1; | |
1697 | else { | |
1698 | mod->gpl_compatible = 0; | |
1699 | break; | |
1700 | } | |
1701 | license = get_next_modinfo(info.modinfo, info.modinfo_len, | |
1702 | "license", license); | |
1703 | } | |
1704 | ||
1da177e4 LT |
1705 | for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
1706 | symname = info.strtab + sym->st_name; | |
1707 | ||
1708 | handle_modversions(mod, &info, sym, symname); | |
1709 | handle_moddevtable(mod, &info, sym, symname); | |
1710 | } | |
d1f25e66 | 1711 | if (!is_vmlinux(modname) || |
10668220 SR |
1712 | (is_vmlinux(modname) && vmlinux_section_warnings)) |
1713 | check_sec_ref(mod, modname, &info); | |
1da177e4 LT |
1714 | |
1715 | version = get_modinfo(info.modinfo, info.modinfo_len, "version"); | |
1716 | if (version) | |
1717 | maybe_frob_rcs_version(modname, version, info.modinfo, | |
1718 | version - (char *)info.hdr); | |
1719 | if (version || (all_versions && !is_vmlinux(modname))) | |
1720 | get_src_version(modname, mod->srcversion, | |
1721 | sizeof(mod->srcversion)-1); | |
1722 | ||
1723 | parse_elf_finish(&info); | |
1724 | ||
8c8ef42a | 1725 | /* Our trick to get versioning for module struct etc. - it's |
1da177e4 LT |
1726 | * never passed as an argument to an exported function, so |
1727 | * the automatic versioning doesn't pick it up, but it's really | |
1728 | * important anyhow */ | |
1729 | if (modversions) | |
8c8ef42a | 1730 | mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4 LT |
1731 | } |
1732 | ||
712f9b46 RR |
1733 | static void read_symbols_from_files(const char *filename) |
1734 | { | |
1735 | FILE *in = stdin; | |
1736 | char fname[PATH_MAX]; | |
1737 | ||
1738 | if (strcmp(filename, "-") != 0) { | |
1739 | in = fopen(filename, "r"); | |
1740 | if (!in) | |
1741 | fatal("Can't open filenames file %s: %m", filename); | |
1742 | } | |
1743 | ||
1744 | while (fgets(fname, PATH_MAX, in) != NULL) { | |
1745 | if (strends(fname, "\n")) | |
1746 | fname[strlen(fname)-1] = '\0'; | |
1747 | read_symbols(fname); | |
1748 | } | |
1749 | ||
1750 | if (in != stdin) | |
1751 | fclose(in); | |
1752 | } | |
1753 | ||
1da177e4 LT |
1754 | #define SZ 500 |
1755 | ||
1756 | /* We first write the generated file into memory using the | |
1757 | * following helper, then compare to the file on disk and | |
1758 | * only update the later if anything changed */ | |
1759 | ||
5c3ead8c SR |
1760 | void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, |
1761 | const char *fmt, ...) | |
1da177e4 LT |
1762 | { |
1763 | char tmp[SZ]; | |
1764 | int len; | |
1765 | va_list ap; | |
62070fa4 | 1766 | |
1da177e4 LT |
1767 | va_start(ap, fmt); |
1768 | len = vsnprintf(tmp, SZ, fmt, ap); | |
7670f023 | 1769 | buf_write(buf, tmp, len); |
1da177e4 LT |
1770 | va_end(ap); |
1771 | } | |
1772 | ||
5c3ead8c | 1773 | void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4 LT |
1774 | { |
1775 | if (buf->size - buf->pos < len) { | |
7670f023 | 1776 | buf->size += len + SZ; |
1da177e4 LT |
1777 | buf->p = realloc(buf->p, buf->size); |
1778 | } | |
1779 | strncpy(buf->p + buf->pos, s, len); | |
1780 | buf->pos += len; | |
1781 | } | |
1782 | ||
c96fca21 SR |
1783 | static void check_for_gpl_usage(enum export exp, const char *m, const char *s) |
1784 | { | |
1785 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1786 | ||
1787 | switch (exp) { | |
1788 | case export_gpl: | |
1789 | fatal("modpost: GPL-incompatible module %s%s " | |
1790 | "uses GPL-only symbol '%s'\n", m, e, s); | |
1791 | break; | |
1792 | case export_unused_gpl: | |
1793 | fatal("modpost: GPL-incompatible module %s%s " | |
1794 | "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s); | |
1795 | break; | |
1796 | case export_gpl_future: | |
1797 | warn("modpost: GPL-incompatible module %s%s " | |
1798 | "uses future GPL-only symbol '%s'\n", m, e, s); | |
1799 | break; | |
1800 | case export_plain: | |
1801 | case export_unused: | |
1802 | case export_unknown: | |
1803 | /* ignore */ | |
1804 | break; | |
1805 | } | |
1806 | } | |
1807 | ||
df578e7d | 1808 | static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca21 SR |
1809 | { |
1810 | const char *e = is_vmlinux(m) ?"":".ko"; | |
1811 | ||
1812 | switch (exp) { | |
1813 | case export_unused: | |
1814 | case export_unused_gpl: | |
1815 | warn("modpost: module %s%s " | |
1816 | "uses symbol '%s' marked UNUSED\n", m, e, s); | |
1817 | break; | |
1818 | default: | |
1819 | /* ignore */ | |
1820 | break; | |
1821 | } | |
1822 | } | |
1823 | ||
1824 | static void check_exports(struct module *mod) | |
b817f6fe SR |
1825 | { |
1826 | struct symbol *s, *exp; | |
1827 | ||
1828 | for (s = mod->unres; s; s = s->next) { | |
6449bd62 | 1829 | const char *basename; |
b817f6fe SR |
1830 | exp = find_symbol(s->name); |
1831 | if (!exp || exp->module == mod) | |
1832 | continue; | |
6449bd62 | 1833 | basename = strrchr(mod->name, '/'); |
b817f6fe SR |
1834 | if (basename) |
1835 | basename++; | |
c96fca21 SR |
1836 | else |
1837 | basename = mod->name; | |
1838 | if (!mod->gpl_compatible) | |
1839 | check_for_gpl_usage(exp->export, basename, exp->name); | |
1840 | check_for_unused(exp->export, basename, exp->name); | |
df578e7d | 1841 | } |
b817f6fe SR |
1842 | } |
1843 | ||
5c3ead8c SR |
1844 | /** |
1845 | * Header for the generated file | |
1846 | **/ | |
1847 | static void add_header(struct buffer *b, struct module *mod) | |
1da177e4 LT |
1848 | { |
1849 | buf_printf(b, "#include <linux/module.h>\n"); | |
1850 | buf_printf(b, "#include <linux/vermagic.h>\n"); | |
1851 | buf_printf(b, "#include <linux/compiler.h>\n"); | |
1852 | buf_printf(b, "\n"); | |
1853 | buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); | |
1854 | buf_printf(b, "\n"); | |
1da177e4 LT |
1855 | buf_printf(b, "struct module __this_module\n"); |
1856 | buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); | |
3c7ec94d | 1857 | buf_printf(b, "\t.name = KBUILD_MODNAME,\n"); |
1da177e4 | 1858 | if (mod->has_init) |
3c7ec94d | 1859 | buf_printf(b, "\t.init = init_module,\n"); |
1da177e4 LT |
1860 | if (mod->has_cleanup) |
1861 | buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n" | |
3c7ec94d | 1862 | "\t.exit = cleanup_module,\n" |
1da177e4 | 1863 | "#endif\n"); |
3c7ec94d | 1864 | buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n"); |
1da177e4 LT |
1865 | buf_printf(b, "};\n"); |
1866 | } | |
1867 | ||
2449b8ba BH |
1868 | static void add_intree_flag(struct buffer *b, int is_intree) |
1869 | { | |
1870 | if (is_intree) | |
1871 | buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n"); | |
1872 | } | |
1873 | ||
5c725138 | 1874 | static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf0 GKH |
1875 | { |
1876 | static const char *staging_dir = "drivers/staging"; | |
1877 | ||
1878 | if (strncmp(staging_dir, name, strlen(staging_dir)) == 0) | |
1879 | buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n"); | |
1880 | } | |
1881 | ||
5c3ead8c SR |
1882 | /** |
1883 | * Record CRCs for unresolved symbols | |
1884 | **/ | |
c53ddacd | 1885 | static int add_versions(struct buffer *b, struct module *mod) |
1da177e4 LT |
1886 | { |
1887 | struct symbol *s, *exp; | |
c53ddacd | 1888 | int err = 0; |
1da177e4 LT |
1889 | |
1890 | for (s = mod->unres; s; s = s->next) { | |
1891 | exp = find_symbol(s->name); | |
1892 | if (!exp || exp->module == mod) { | |
c53ddacd | 1893 | if (have_vmlinux && !s->weak) { |
2a116659 MW |
1894 | if (warn_unresolved) { |
1895 | warn("\"%s\" [%s.ko] undefined!\n", | |
1896 | s->name, mod->name); | |
1897 | } else { | |
1898 | merror("\"%s\" [%s.ko] undefined!\n", | |
1899 | s->name, mod->name); | |
1900 | err = 1; | |
1901 | } | |
c53ddacd | 1902 | } |
1da177e4 LT |
1903 | continue; |
1904 | } | |
1905 | s->module = exp->module; | |
1906 | s->crc_valid = exp->crc_valid; | |
1907 | s->crc = exp->crc; | |
1908 | } | |
1909 | ||
1910 | if (!modversions) | |
c53ddacd | 1911 | return err; |
1da177e4 LT |
1912 | |
1913 | buf_printf(b, "\n"); | |
1914 | buf_printf(b, "static const struct modversion_info ____versions[]\n"); | |
3ff6eecc | 1915 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1916 | buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n"); |
1917 | ||
1918 | for (s = mod->unres; s; s = s->next) { | |
df578e7d | 1919 | if (!s->module) |
1da177e4 | 1920 | continue; |
1da177e4 | 1921 | if (!s->crc_valid) { |
cb80514d | 1922 | warn("\"%s\" [%s.ko] has no CRC!\n", |
1da177e4 LT |
1923 | s->name, mod->name); |
1924 | continue; | |
1925 | } | |
a53a11f3 | 1926 | buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n", |
a4b6a77b | 1927 | s->crc, s->name); |
1da177e4 LT |
1928 | } |
1929 | ||
1930 | buf_printf(b, "};\n"); | |
c53ddacd KK |
1931 | |
1932 | return err; | |
1da177e4 LT |
1933 | } |
1934 | ||
5c3ead8c SR |
1935 | static void add_depends(struct buffer *b, struct module *mod, |
1936 | struct module *modules) | |
1da177e4 LT |
1937 | { |
1938 | struct symbol *s; | |
1939 | struct module *m; | |
1940 | int first = 1; | |
1941 | ||
df578e7d | 1942 | for (m = modules; m; m = m->next) |
1da177e4 | 1943 | m->seen = is_vmlinux(m->name); |
1da177e4 LT |
1944 | |
1945 | buf_printf(b, "\n"); | |
1946 | buf_printf(b, "static const char __module_depends[]\n"); | |
3ff6eecc | 1947 | buf_printf(b, "__used\n"); |
1da177e4 LT |
1948 | buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n"); |
1949 | buf_printf(b, "\"depends="); | |
1950 | for (s = mod->unres; s; s = s->next) { | |
a61b2dfd | 1951 | const char *p; |
1da177e4 LT |
1952 | if (!s->module) |
1953 | continue; | |
1954 | ||
1955 | if (s->module->seen) | |
1956 | continue; | |
1957 | ||
1958 | s->module->seen = 1; | |
df578e7d SR |
1959 | p = strrchr(s->module->name, '/'); |
1960 | if (p) | |
a61b2dfd SR |
1961 | p++; |
1962 | else | |
1963 | p = s->module->name; | |
1964 | buf_printf(b, "%s%s", first ? "" : ",", p); | |
1da177e4 LT |
1965 | first = 0; |
1966 | } | |
1967 | buf_printf(b, "\";\n"); | |
1968 | } | |
1969 | ||
5c3ead8c | 1970 | static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4 LT |
1971 | { |
1972 | if (mod->srcversion[0]) { | |
1973 | buf_printf(b, "\n"); | |
1974 | buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n", | |
1975 | mod->srcversion); | |
1976 | } | |
1977 | } | |
1978 | ||
5c3ead8c | 1979 | static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4 LT |
1980 | { |
1981 | char *tmp; | |
1982 | FILE *file; | |
1983 | struct stat st; | |
1984 | ||
1985 | file = fopen(fname, "r"); | |
1986 | if (!file) | |
1987 | goto write; | |
1988 | ||
1989 | if (fstat(fileno(file), &st) < 0) | |
1990 | goto close_write; | |
1991 | ||
1992 | if (st.st_size != b->pos) | |
1993 | goto close_write; | |
1994 | ||
1995 | tmp = NOFAIL(malloc(b->pos)); | |
1996 | if (fread(tmp, 1, b->pos, file) != b->pos) | |
1997 | goto free_write; | |
1998 | ||
1999 | if (memcmp(tmp, b->p, b->pos) != 0) | |
2000 | goto free_write; | |
2001 | ||
2002 | free(tmp); | |
2003 | fclose(file); | |
2004 | return; | |
2005 | ||
2006 | free_write: | |
2007 | free(tmp); | |
2008 | close_write: | |
2009 | fclose(file); | |
2010 | write: | |
2011 | file = fopen(fname, "w"); | |
2012 | if (!file) { | |
2013 | perror(fname); | |
2014 | exit(1); | |
2015 | } | |
2016 | if (fwrite(b->p, 1, b->pos, file) != b->pos) { | |
2017 | perror(fname); | |
2018 | exit(1); | |
2019 | } | |
2020 | fclose(file); | |
2021 | } | |
2022 | ||
bd5cbced | 2023 | /* parse Module.symvers file. line format: |
534b89a9 | 2024 | * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbced | 2025 | **/ |
040fcc81 | 2026 | static void read_dump(const char *fname, unsigned int kernel) |
1da177e4 LT |
2027 | { |
2028 | unsigned long size, pos = 0; | |
2029 | void *file = grab_file(fname, &size); | |
2030 | char *line; | |
2031 | ||
df578e7d | 2032 | if (!file) |
1da177e4 LT |
2033 | /* No symbol versions, silently ignore */ |
2034 | return; | |
2035 | ||
2036 | while ((line = get_next_line(&pos, file, size))) { | |
534b89a9 | 2037 | char *symname, *modname, *d, *export, *end; |
1da177e4 LT |
2038 | unsigned int crc; |
2039 | struct module *mod; | |
040fcc81 | 2040 | struct symbol *s; |
1da177e4 LT |
2041 | |
2042 | if (!(symname = strchr(line, '\t'))) | |
2043 | goto fail; | |
2044 | *symname++ = '\0'; | |
2045 | if (!(modname = strchr(symname, '\t'))) | |
2046 | goto fail; | |
2047 | *modname++ = '\0'; | |
9ac545b0 | 2048 | if ((export = strchr(modname, '\t')) != NULL) |
bd5cbced | 2049 | *export++ = '\0'; |
534b89a9 SR |
2050 | if (export && ((end = strchr(export, '\t')) != NULL)) |
2051 | *end = '\0'; | |
1da177e4 LT |
2052 | crc = strtoul(line, &d, 16); |
2053 | if (*symname == '\0' || *modname == '\0' || *d != '\0') | |
2054 | goto fail; | |
df578e7d SR |
2055 | mod = find_module(modname); |
2056 | if (!mod) { | |
2057 | if (is_vmlinux(modname)) | |
1da177e4 | 2058 | have_vmlinux = 1; |
0fa3a88c | 2059 | mod = new_module(modname); |
1da177e4 LT |
2060 | mod->skip = 1; |
2061 | } | |
bd5cbced | 2062 | s = sym_add_exported(symname, mod, export_no(export)); |
8e70c458 SR |
2063 | s->kernel = kernel; |
2064 | s->preloaded = 1; | |
bd5cbced | 2065 | sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4 LT |
2066 | } |
2067 | return; | |
2068 | fail: | |
2069 | fatal("parse error in symbol dump file\n"); | |
2070 | } | |
2071 | ||
040fcc81 SR |
2072 | /* For normal builds always dump all symbols. |
2073 | * For external modules only dump symbols | |
2074 | * that are not read from kernel Module.symvers. | |
2075 | **/ | |
2076 | static int dump_sym(struct symbol *sym) | |
2077 | { | |
2078 | if (!external_module) | |
2079 | return 1; | |
2080 | if (sym->vmlinux || sym->kernel) | |
2081 | return 0; | |
2082 | return 1; | |
2083 | } | |
62070fa4 | 2084 | |
5c3ead8c | 2085 | static void write_dump(const char *fname) |
1da177e4 LT |
2086 | { |
2087 | struct buffer buf = { }; | |
2088 | struct symbol *symbol; | |
2089 | int n; | |
2090 | ||
2091 | for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { | |
2092 | symbol = symbolhash[n]; | |
2093 | while (symbol) { | |
040fcc81 | 2094 | if (dump_sym(symbol)) |
bd5cbced | 2095 | buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n", |
62070fa4 | 2096 | symbol->crc, symbol->name, |
bd5cbced RP |
2097 | symbol->module->name, |
2098 | export_str(symbol->export)); | |
1da177e4 LT |
2099 | symbol = symbol->next; |
2100 | } | |
2101 | } | |
2102 | write_if_changed(&buf, fname); | |
2103 | } | |
2104 | ||
2d04b5ae RH |
2105 | struct ext_sym_list { |
2106 | struct ext_sym_list *next; | |
2107 | const char *file; | |
2108 | }; | |
2109 | ||
5c3ead8c | 2110 | int main(int argc, char **argv) |
1da177e4 LT |
2111 | { |
2112 | struct module *mod; | |
2113 | struct buffer buf = { }; | |
040fcc81 | 2114 | char *kernel_read = NULL, *module_read = NULL; |
712f9b46 | 2115 | char *dump_write = NULL, *files_source = NULL; |
1da177e4 | 2116 | int opt; |
c53ddacd | 2117 | int err; |
2d04b5ae RH |
2118 | struct ext_sym_list *extsym_iter; |
2119 | struct ext_sym_list *extsym_start = NULL; | |
1da177e4 | 2120 | |
712f9b46 | 2121 | while ((opt = getopt(argc, argv, "i:I:e:msST:o:awM:K:")) != -1) { |
df578e7d SR |
2122 | switch (opt) { |
2123 | case 'i': | |
2124 | kernel_read = optarg; | |
2125 | break; | |
2126 | case 'I': | |
2127 | module_read = optarg; | |
2128 | external_module = 1; | |
2129 | break; | |
2d04b5ae RH |
2130 | case 'e': |
2131 | external_module = 1; | |
2132 | extsym_iter = | |
2133 | NOFAIL(malloc(sizeof(*extsym_iter))); | |
2134 | extsym_iter->next = extsym_start; | |
2135 | extsym_iter->file = optarg; | |
2136 | extsym_start = extsym_iter; | |
2137 | break; | |
df578e7d SR |
2138 | case 'm': |
2139 | modversions = 1; | |
2140 | break; | |
2141 | case 'o': | |
2142 | dump_write = optarg; | |
2143 | break; | |
2144 | case 'a': | |
2145 | all_versions = 1; | |
2146 | break; | |
2147 | case 's': | |
2148 | vmlinux_section_warnings = 0; | |
2149 | break; | |
588ccd73 SR |
2150 | case 'S': |
2151 | sec_mismatch_verbose = 0; | |
2152 | break; | |
712f9b46 RR |
2153 | case 'T': |
2154 | files_source = optarg; | |
2155 | break; | |
df578e7d SR |
2156 | case 'w': |
2157 | warn_unresolved = 1; | |
2158 | break; | |
2159 | default: | |
2160 | exit(1); | |
1da177e4 LT |
2161 | } |
2162 | } | |
2163 | ||
040fcc81 SR |
2164 | if (kernel_read) |
2165 | read_dump(kernel_read, 1); | |
2166 | if (module_read) | |
2167 | read_dump(module_read, 0); | |
2d04b5ae RH |
2168 | while (extsym_start) { |
2169 | read_dump(extsym_start->file, 0); | |
2170 | extsym_iter = extsym_start->next; | |
2171 | free(extsym_start); | |
2172 | extsym_start = extsym_iter; | |
2173 | } | |
1da177e4 | 2174 | |
df578e7d | 2175 | while (optind < argc) |
1da177e4 | 2176 | read_symbols(argv[optind++]); |
1da177e4 | 2177 | |
712f9b46 RR |
2178 | if (files_source) |
2179 | read_symbols_from_files(files_source); | |
2180 | ||
b817f6fe SR |
2181 | for (mod = modules; mod; mod = mod->next) { |
2182 | if (mod->skip) | |
2183 | continue; | |
c96fca21 | 2184 | check_exports(mod); |
b817f6fe SR |
2185 | } |
2186 | ||
c53ddacd KK |
2187 | err = 0; |
2188 | ||
1da177e4 | 2189 | for (mod = modules; mod; mod = mod->next) { |
666ab414 AK |
2190 | char fname[strlen(mod->name) + 10]; |
2191 | ||
1da177e4 LT |
2192 | if (mod->skip) |
2193 | continue; | |
2194 | ||
2195 | buf.pos = 0; | |
2196 | ||
2197 | add_header(&buf, mod); | |
2449b8ba | 2198 | add_intree_flag(&buf, !external_module); |
a9860bf0 | 2199 | add_staging_flag(&buf, mod->name); |
c53ddacd | 2200 | err |= add_versions(&buf, mod); |
1da177e4 LT |
2201 | add_depends(&buf, mod, modules); |
2202 | add_moddevtable(&buf, mod); | |
2203 | add_srcversion(&buf, mod); | |
2204 | ||
2205 | sprintf(fname, "%s.mod.c", mod->name); | |
2206 | write_if_changed(&buf, fname); | |
2207 | } | |
2208 | ||
2209 | if (dump_write) | |
2210 | write_dump(dump_write); | |
588ccd73 | 2211 | if (sec_mismatch_count && !sec_mismatch_verbose) |
7c0ac495 GU |
2212 | warn("modpost: Found %d section mismatch(es).\n" |
2213 | "To see full details build your kernel with:\n" | |
2214 | "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n", | |
2215 | sec_mismatch_count); | |
1da177e4 | 2216 | |
c53ddacd | 2217 | return err; |
1da177e4 | 2218 | } |